Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
  • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
  • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
  • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
  • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
  • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
  • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
  • B60R21/215—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member
  • B60R21/2165—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components characterised by the covers for the inflatable member characterised by a tear line for defining a deployment opening
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
  • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
  • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
  • B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
  • B60R21/2171—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together specially adapted for elongated cylindrical or bottle-like inflators with a symmetry axis perpendicular to the main direction of bag deployment, e.g. extruded reaction canisters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
  • B29L2031/3005—Body finishings
  • B29L2031/3038—Air bag covers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
  • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
  • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
  • B60R21/20—Arrangements for storing inflatable members in their non-use or deflated condition; Arrangement or mounting of air bag modules or components
  • B60R21/217—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together
  • B60R2021/2172—Inflation fluid source retainers, e.g. reaction canisters; Connection of bags, covers, diffusers or inflation fluid sources therewith or together the cover being connected to the surrounding part and to the module, e.g. floating mounts

Definitions

• Vehicle interior members having an airbag door portion and a method of forming the same Background Art
• vehicle interior members such as instrument panels, door trims, and center villas having an airbag door portion are disclosed in Japanese Patent Application Laid-Open No. 8-
• the structure disclosed in Japanese Patent Application Publication No. 1926666 is known.
• the body portion of the instrument panel having an opening portion for an airbag door is injection-molded with a thermoplastic resin, and then the airbag door portion (opening portion) is formed.
• the main body of the instrument panel and the airbag door are formed by so-called two-color molding (double-injection molding) by injection-molding the same with a thermoplastic elastomer.
• two-color molding double-injection molding
• the elasticity of the resin in the main body is 6-7 times higher than the elasticity of the resin ( ⁇ ⁇ ) in the airbag door and 1.5-2 times higher in tensile strength.
• the rupture force of the ⁇ ⁇ -shaped fractured part (tear part) at the same thickness increases when the airbag door is unfolded, making it difficult for the airbag door to unfold and the hinge part to be damaged during the unfolding.
• the resin thickness at the broken part is too thin, underfilling during molding and sticky deformation will occur.
• the appearance quality is degraded because irregularities are visible around the thin-walled portion from the design surface side due to elbow marks, undulations, and the like.
• the breaking force (tear portion) at the time of deployment formed in the airbag door becomes high, and the airbag door becomes difficult to deploy.
• the resin thickness at the break is reduced. If too thin, the thin-walled part can be seen from the design surface side, and the appearance quality will deteriorate.This is because the airbag door and the main body of the vehicle interior member such as the instrument panel, door trim, and center villa will not be connected.
• Interior parts for vehicles integrally molded by two-color molding using different resins, and the airbag door and the main body of the instrument panel are separately molded and then integrated using locking claws or screws. It also occurs at the broken part of the vehicle interior member.
• Japanese Patent Application Laid-Open No. 7-1799-161 Japanese Patent Application Laid-Open No. 2-14747452, Japanese Patent Application Laid-Open No. 2-14747452, in which a bead is formed along a tier in a retrofit resin door.
• Japanese Patent Application Laid-Open No. 5-185988 / 1995 in which a blade is set at the tip of a door iron plate insert in a foam instrument panel, is disclosed in Japanese Patent Laid-Open Publication No.
• Japanese Patent Application Laid-Open No. 7-210708 discloses a method for reinforcing a hinge portion of an instrument panel, and discloses a skin instrument panel in which a door substrate and an instrument panel substrate are integrally formed.
• Japanese Unexamined Patent Publication No. Heisei 8-2900749 in which a hinge is provided with reinforcement measures
• Japanese Patent Laid-Open Publication No. Heisei 2-28 in which a rib for applying a maximum shearing force is integrally formed on a tier of a separate door.
• No. 3 5 4 6 Thin resin layer on can lid A line is formed so as to surround the opening, and a thin line is provided with a hold line.
• a tier portion formed in an airbag door portion, and push-up means for pushing up a portion on both sides or one side of the airbag door portion sandwiching a central portion of the tier portion when the airbag body is deployed.
• the impact load from the airbag bag concentrates at the center of the tier, and the airbag ruptures smoothly from the center of the tier.
• the tier part is thick, it can be easily broken, and it is possible to achieve both deployment performance and appearance quality (invisible).
• the tear portion is broken first, the burden on the hinge portion of the airbag door can be reduced.
• the airbag door portion can be made of a highly rigid and hard material, sticky feeling and deformation can be prevented.
• a tear portion formed on the airbag door portion is provided below the airbag door portion, and the tear portion protrudes toward the tier portion from the hinge portion of the airbag door portion.
• the door hinge part protection plate is provided, the air bag body can be prevented from directly contacting the hinge part of the air bag door part when the air bag body is deployed. Can be prevented from being damaged.
• the hinge portion of the airbag door can be protected, it is easy to break from the relatively low-strength tee portion.
• the resin flow boundary is set in the core back region for forming the tier portion when the airbag door portion is deployed, and the line of the tier portion cannot be seen from the design surface side.
• the resin flow boundary breaks due to a decrease in strength.
• the breaking force of the part can be reduced to a desired value.
• the line of the broken part can not be seen at all from the design surface side, and it is possible to prevent the deterioration of the appearance quality and to improve the heat aging performance.
• the support and the surface rigidity of the entire airbag door are improved.
• the push-up means includes the airbag door portion on both sides or one side of the airbag door portion with the center portion of the tier portion interposed therebetween. It is a projection which is provided integrally with and protrudes downward. Therefore, when the airbag body is deployed, an impact load is momentarily applied to the projection from the airbag body, and the airbag body breaks smoothly from the center of the tier. In addition, it is possible to achieve both appearance quality and deployment performance with a simple configuration that only requires a projection on the airbag door.
• the push-up means is disposed below the airbag door portion, and sandwiches a center portion of the tier portion when the airbag body is deployed.
• a metal plate provided with a projection on at least one of a lower surface and an upper surface of a front end portion that comes into contact with both sides or one side of the airbag door portion. Therefore, when the airbag bag is deployed, the impact load from the airbag bag concentrates on the central portion of the tee portion due to the metal plate, and the tee portion is smoothly broken from the central portion. As a result, both appearance quality and deployment performance can be achieved. Also, by using a metal plate, it can be applied to a conventional vehicle interior member.
• the push-up means is disposed below the airbag door portion, and sandwiches a central portion of the tier portion when the airbag body is deployed.
• a metal plate provided with a narrow projection on the upper surface of the front end portion abutting on both sides or one side of the airbag door portion.
• the push-up means is A metal plate which is disposed below the airbag door portion and has a tip portion which comes into contact with both sides or one side portion of the airbag door portion with the center portion of the tee portion interposed therebetween when the airbag body is deployed.
• the hinge portion of the metal plate is offset from the hinge portion of the airbag door portion to the tier side, and the fixed portion of the metal plate is fixed to the hinge portion of the metal plate.
• the part on the tier side of the hinge part of the metal plate has high rigidity.
• the metal plate can prevent the airbag bag from directly contacting the hinge of the airbag door when the airbag is deployed, so that the hinge of the airbag door can be damaged by the airbag. Can be prevented.
• the hinge portion of the airbag door portion is a thin portion having a predetermined thickness over a predetermined front and rear width adjacent to the case mounting portion. Since the groove which is formed and serves as a bending point is set in the middle of the front-rear width of the thin portion, the bending point can be separated from the case mounting portion where the plate thickness changes suddenly. Surface elongation) can be reduced. Moreover, since the groove is formed in the bending point, the surface development length of the bending portion can be increased, and the substantial deployment rate can be reduced, so that the hinge portion can be effectively prevented from being damaged due to bending when the airbag bag is deployed. it can.
• the airbag door portion and the main body portion are integrally formed of the same hard resin material or are formed separately.
• the airbag door portion and the main body portion are integrally formed of the same hard resin material or are separated from each other, the impact load from the airbag bag body to the center of the tier portion when the airbag bag body is deployed. Concentrate and break smoothly from the center of the tier. As a result, even if the thickness of the tier is large, it can be easily broken, and it is possible to achieve both deployment performance and appearance quality (invisible). In addition, since the tier breaks first, the burden on the hinge of the airbag door can be reduced. Further Since the airbag door can be made of a hard material having high rigidity, it is possible to prevent the squeaky feeling and deformation.
• the airbag door portion and the main body portion are formed integrally or separately from the same hard resin material, and the surfaces of these base materials are formed.
• the impact load from the airbag body is concentrated at the center of the tier, and the base material and the skin of the airbag door part are smoothly broken.
• the thickness of the tier portion of the base material of the airbag door is increased, it can be easily broken, so that the deployment performance and the appearance quality transferred to the skin are deteriorated (weld sink marks and undulation of the base material). Unevenness) can be achieved at the same time.
• it can be made of a hard resin material having high rigidity, it is possible to prevent a feeling of deformation and deformation.
• the airbag door and the main body are integrally formed of the same hard resin material, a complicated mold configuration is not required as compared with two-color molding, and post-processing of the base material is not required.
• the airbag door portion and the main body portion are formed integrally or separately from the same hard resin material, and the surfaces of these base materials are formed.
• a common or separate foam layer and a tiered skin are integrally foamed.
• the impact load from the airbag bag concentrates on the center of the tier, and the base material, the foam layer, and the skin of the airbag door break smoothly.
• the thickness of the tier portion of the base material of the airbag door portion is increased, it is possible to easily break the tier portion, so that both the deployment performance and the prevention of underfill during molding can be achieved.
• it can be made of a hard resin material having high rigidity, there is no sense of undulation that easily occurs during heat resistance evaluation.
• the main body portion and the airbag door portion of the vehicle interior member which are integrated or separated, are formed by injection molding with the same resin. .
• the breaking force at the break can be reduced to a desired value due to a decrease in strength due to the resin flow boundary.
• the resin thickness at the fractured part is extremely thin. This eliminates the need to make the line, so that the line of the broken part can not be seen at all from the design side, preventing the deterioration of the appearance quality, improving the heat aging resistance, and supporting and supporting the entire airbag door. Rigidity also improves. Further, when the airbag door and the main body are integrally formed of the same resin, the interior of the vehicle does not need to be coated with two types of materials, resulting in low cost.
• the airbag door portion is formed by integrating the body portion of the vehicle interior member and the airbag door portion by two-color molding using different resins. Have.
• the main body portion and the airbag door portion of the base material of the vehicle interior member, which are integrated or separate, are projected using the same resin.
• the airbag door is formed by molding, and the base material is covered with a skin with or without a tear portion.
• the main body portion and the airbag door portion of the base material of the vehicle interior member, which are integrated or separated, are formed using the same resin.
• the base is covered with a tiered skin, and a foam layer is formed between the skin and the base.
• the cavity is divided at the tier by bringing a slide core having a substantially triangular tip into contact with or close to a fixed mold.
• a resin is injected into each of the divided cavities, and the slide core is retracted by a small amount before and after the filling is completed.
• the slide core having a substantially triangular tip divides the cavity of the airbag door, and in this state, injects the resin into each cavity, and reduces the amount of the slide core before and after the resin is completely charged.
• the resin flow boundary can be set at the broken part when the airbag door is deployed by a simple method of retracting. As a result, existing molding equipment can be used, and molding can be performed at low cost. In addition, because of the simple method, it is highly reliable in securing functional quality and the productivity is high.
• the breaking strength of the tier portion is controlled by combining the holding pressure before and after the filling, the core back timing, and the thickness around the tier portion. I do.
• the breaking strength of the broken portion can be easily and accurately controlled to a desired value by combining the pressure holding before and after the completion of filling, the core back timing, and the thickness around the broken portion.
• the core back timing is set after completion of the charging.
• the core back timing is earlier than the filling completion, the previously filled resin will flow into the space on the unfilled side, and the resin flow boundary will be broken by the slide core.
• the core back timing is set after the filling is completed, so that the positional deviation between the resin flow boundary and the portion to be fractured is set. Can be prevented.
• the holding pressure after completion of the charging is reduced in several steps, and the core back timing is set to a second or later holding pressure.
• the first-stage holding pressure is surely performed, so that the weight, dimensions, and shape of the molded product can be stabilized, and product defects Generation can be reduced.
• a tier formed on an airbag door portion and a portion on both sides or one side of an airbag door portion sandwiching a center portion of the tier portion when the airbag body is deployed. And a push-up means.
• the resin flow boundary is set in a core back region for forming the tear portion, and the line of the tear portion is not visible from the design surface side.
• FIG. 1 is an enlarged sectional view taken along line 11 in FIG.
• FIG. 2 is an enlarged sectional side view showing a main part of a vehicle interior member having an airbag door according to the first embodiment of the present invention.
• FIG. 3 is a perspective view showing an instrument panel as a vehicle interior member having an airbag door portion according to the first embodiment of the present invention, as viewed obliquely from the rear of the vehicle.
• FIG. 4 is a vehicle interior having an airbag door according to the first embodiment of the present invention. It is an enlarged plan view which shows the protrusion of a material.
• FIG. 5 is an enlarged plan view showing a protrusion of a vehicle interior member having an airbag door portion according to a modification of the first embodiment of the present invention.
• FIG. 6A is a schematic plan view showing a positional relationship between a projection and a tier of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.
• FIG. 6B is a schematic plan view showing a positional relationship between a projection and a tier of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.
• FIG. 6C is a schematic plan view showing a positional relationship between a protrusion and a tier of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.
• FIG. 6D is a schematic plan view showing a positional relationship between a projection and a tier of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.
• FIG. 6E is a schematic plan view showing a positional relationship between a projection and a tier of a vehicle interior member having an airbag door according to a modification of the first embodiment of the present invention.
• FIG. 7 is a side sectional view, corresponding to FIG. 1, showing a vehicle interior member having an airbag door according to a second embodiment of the present invention.
• FIG. 8 is an operation explanatory view showing a vehicle interior member having an airbag door according to a second embodiment of the present invention.
• FIG. 9 is a plan view showing a metal plate of a vehicle interior member having an airbag door according to a second embodiment of the present invention.
• FIG. 10 is a side sectional view corresponding to FIG. 8 showing a vehicle interior member having an airbag door portion according to a modification of the second embodiment of the present invention.
• FIG. 11 is a plan view showing a metal plate of a vehicle interior member having an airbag door portion according to a modification of the second embodiment of the present invention.
• FIG. 12 is a side sectional view corresponding to FIG. 1 showing an interior member for a vehicle having an airbag door portion according to a third embodiment of the present invention.
• FIG. 13 is an operation explanatory view showing a vehicle interior member having an airbag door portion according to a third embodiment of the present invention.
• FIG. 14 is a side sectional view corresponding to FIG. 1 showing a vehicle interior member having an airbag door portion according to a modification of the third embodiment of the present invention.
• FIG. 15 is a side sectional view corresponding to FIG. 1 showing a vehicle interior member having an airbag door portion according to a fourth embodiment of the present invention.
• FIG. 16 is a side sectional view corresponding to FIG. 1 showing a vehicle interior member having an airbag door portion according to a fifth embodiment of the present invention.
• FIG. 17A is a cross-sectional view showing a skin of a vehicle interior member having an airbag door portion according to the present invention by skin insert molding.
• FIG. 17B is a cross-sectional view showing a skin formed by skin insert molding of a vehicle interior member having an airbag door according to the present invention.
• FIG. 17C is a cross-sectional view showing a skin by insert molding of a vehicle interior member having an airbag door portion according to the present invention.
• FIG. 18A is a cross-sectional view showing a skin formed by paste-forming an interior member for a vehicle having an airbag door portion according to the present invention.
• FIG. 18B is a cross-sectional view showing a skin formed by paste-forming the vehicle interior member having the airbag door portion according to the present invention.
• FIG. 19 is a side sectional view corresponding to FIG. 1 showing a vehicle interior member having an airbag door portion according to a sixth embodiment of the present invention.
• FIG. 20 is a side sectional view, corresponding to FIG. 1, showing a vehicle interior member having an airbag door portion according to a seventh embodiment of the present invention.
• FIG. 21 is an operation explanatory view showing a vehicle interior member having an airbag door portion according to a seventh embodiment of the present invention.
• FIG. 22 is an enlarged plan view showing the back surface of the airbag door portion of the vehicle interior member having the airbag door portion according to the seventh embodiment of the present invention.
• FIG. 23A is a schematic plan view showing a positional relationship between a groove and a tier of a vehicle interior member having an airbag door according to a modification of the seventh embodiment of the present invention.
• FIG. 23B is a schematic plan view showing a positional relationship between a groove and a tier of a vehicle interior member having an airbag door according to a modification of the seventh embodiment of the present invention.
• FIG. 23C is a schematic plan view illustrating a positional relationship between a groove and a tier of an interior member for a vehicle having an airbag door according to a modification of the seventh embodiment of the present invention.
• FIG.23D has an airbag door portion according to a modification of the seventh embodiment of the present invention.
• FIG. 3 is a schematic plan view showing a positional relationship between a groove and a tier of a vehicle interior member.
• FIG. 23E is a schematic plan view showing a positional relationship between a groove and a tier of a vehicle interior member having an airbag door according to a modification of the seventh embodiment of the present invention.
• FIG. 23F is a schematic plan view showing a positional relationship between a groove and a tier of an interior member for a vehicle having an airbag door according to a modification of the seventh embodiment of the present invention.
• FIG. 24 is an enlarged sectional view taken along the line 11 in FIG.
• FIG. 25 is a perspective view showing a vehicle interior member integrally including an airbag door portion according to an eighth embodiment of the present invention.
• FIG. 26 is a schematic cross-sectional view showing one step in a method for forming a vehicle interior member integrally having an airbag door portion according to the eighth embodiment of the present invention.
• FIG. 27 is a schematic cross-sectional view showing one step in a method of forming a vehicle interior member integrally including an airbag door portion according to a seventh embodiment of the present invention.
• FIG. 28 is a timing chart showing a method for molding a vehicle interior member integrally having an airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29A is a schematic plan view showing a range of a slide core with respect to an H-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an eighth embodiment of the present invention.
• FIG. 29B is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally including the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29C is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally including the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29D is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally having the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29E is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally including the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29F is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally having the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29G is a schematic plan view showing the range of the slide core with respect to the H-shaped thin portion of the vehicle interior member integrally including the airbag door portion according to the eighth embodiment of the present invention.
• FIG. 29H is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an application example of the present invention.
• FIG. 29I is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an application example of the present invention.
• FIG. 29J is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an application example of the present invention.
• FIG. 29H is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an application example of the present invention.
• FIG. 29I is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior
• FIG. 29K is a schematic plan view showing a range of a slide core with respect to a U-shaped thin portion of a vehicle interior member integrally having an airbag door portion according to an application example of the present invention.
• FIG. 30A is a schematic sectional view showing a sectional shape of a thin portion of a vehicle interior member integrally including an airbag door portion according to an application example of the eighth embodiment of the present invention.
• FIG. 30B is a schematic sectional view showing a sectional shape of a thin portion of a vehicle interior member integrally including an airbag door portion according to an application example of the eighth embodiment of the present invention.
• FIG. 31 is a schematic cross-sectional view showing one step in a molding step of a vehicle interior member integrally including an airbag door portion according to an application example of the eighth embodiment of the present invention.
• FIG. 32A is a side cross-sectional view showing an airbag door portion of a vehicle interior member integrally including an airbag door portion according to an application example of one embodiment of the present invention.
• FIG. 32B is a perspective view showing an airbag door part of a vehicle interior member integrally having an airbag door part according to an application example of one embodiment of the present invention.
• FIG. 33 is a graph showing a change in holding pressure during molding of a vehicle interior member integrally having an airbag door portion according to the eighth embodiment of the present invention.
• FIG. 34 is a cross-sectional view corresponding to FIG. 24 showing a vehicle interior member integrally having an airbag door portion according to an application example of the eighth embodiment of the present invention.
• FIG. 35 shows an airbag door unit according to another application example of the eighth embodiment of the present invention.
• FIG. 25 is a cross-sectional view corresponding to FIG. 24 showing the vehicle interior member included in FIG.
• FIG. 36 is a cross-sectional view illustrating two factors that affect the welding strength between the first resin and the second resin.
• FIG. 37A is a graph showing the relationship between the dwelling pressure and the tear strength at the tier.
• FIG. 37B is a graph showing the relationship between the core back timing and the tear strength at the tear portion.
• FIG. 37C is a graph showing the relationship between the thickness around the tier and the tear strength of the tier.
• FIG. 38 is a cross-sectional view corresponding to FIG. 24 showing a vehicle interior member integrally having an airbag door portion according to another embodiment of the present invention.
• FIG. 39 is a cross-sectional view corresponding to FIG. 24 showing a vehicle interior member integrally having an airbag door portion according to another embodiment of the present invention.
• FIG. 40 is a cross-sectional view corresponding to FIG. 24 showing a vehicle interior member integrally having an airbag door portion according to another embodiment of the present invention.
• BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a vehicle interior member having an airbag door portion of the present invention will be described with reference to FIGS.
• the arrow FR in the figure indicates the forward direction of the vehicle, and the arrow UP indicates the upward direction of the vehicle.
• an airbag device 12 is disposed inside a passenger seat side of an instrument panel 10 as a vehicle interior member provided in a vehicle cabin of a vehicle.
• the airbag case 14 of the airbag device 12 is fixed to an instrument panel / reinforcement (not shown).
• the airbag bag 18 is stored in a folded state.
• the portion of the instrument panel 10 that is substantially opposed to the airbag case 14 is an airbag door portion 20, and the portion other than the airbag door portion 20 of the instrument panel 10 is the main body portion 2. It is 2.
• These airbag door sections 20 and the main body 22 are made from TS 0 P [elastomer (rubber) and PP (polypropylene) as hard resin by broiling (technology to produce a high-molecular-weight multi-component material that can be expected to have a synergistic effect).
• It is a composite reinforced by adding talc, which has impact resistance and rigidity, has good fluidity, and is a low-density PP resin suitable for thin-walled products, such as a flexural modulus of 1500 to 300 MPa] or PP resin, PC / AB S resin, modified PPO resin, PC ZP BT resin, ABS resin, PC resin, ASG resin, TPO resin, TPE resin, TPU resin, P CZ modified It is made of PS resin or the like.
• the airbag device 12 When a sudden deceleration of the vehicle is detected by a mechanical or electric acceleration sensor or the like (not shown), the airbag device 12 activates the inflation device 16 in the airbag case 14 to operate the airbag device.
• the airbag body 18 folded and accommodated in the case 14 is inflated toward the airbag door portion 20 of the instrument panel 10.
• the airbag body 18 presses the airbag door portion 20 of the instrument panel 10 to cleave the airbag door portion 20 and expand into the vehicle interior.
• a conventionally known general configuration can be applied to the airbag device 12, a detailed description of the airbag device 12 is omitted in the present embodiment.
• a thin tier portion 24 is formed in an H shape in a plan view at a substantially central portion in the front-rear direction and at both ends in the left-right direction of the airbag door portion 20.
• the cross section of the tier portion 24 of the airbag door portion 20 is V-shaped.
• projections 28, 30 as projection means are protruded downward on both sides in the vehicle longitudinal direction with the center section 24A of the tier section 24 interposed therebetween.
• the projections 28 and 30 are formed integrally with the airbag door 20. Therefore, when the airbag bag is deployed, the deployed airbag bag comes into contact with the lower surfaces 28, 3OA of the projections 28, 30 and raises the projections 28, 30 upward (arrow A in FIG. 2).
• Direction
• the projections 28, 30 are formed in a lattice shape with narrow ribs 32 extending in the vehicle longitudinal direction and narrow ribs 34 extending in the vehicle width direction. These ribs
• T 1 is less than 1 Z 2 of thick wall of airbag door 20 shown in Fig. 2. Is set to prevent sink marks.
• the width W 1 and the length L 1 of the projections 28 and 30 are the same as those of the airbag door 2 shown in FIG.
• the airbag door section 20 has projections 28,
• the flexure in the width and length directions is not extremely impaired by 30 and the airbag door section 20 flexes in the width and length directions when the airbag bag is deployed.
• the center 24 of the part 24 is surely broken from 24 A.
• thin hinge portions 26 are formed at both ends in the front-rear direction of the airbag door portion 20. Therefore, when the airbag door portion 20 is pressed by the inflating airbag bag member 18 when the airbag is deployed, the airbag door portion 20 is torn along the tier portion 24, and the torn front door portion 2OA and the rear door portion are opened.
• An opening that allows the airbag body 18 to be deployed in the vehicle cabin is formed by rotating about 20 B and the hinge part 26 as a center.
• each corner 28B, 30B, 28C, 3C of the projection 28, 30 which comes into contact with the airbag 18 when the airbag is deployed.
• 0 C, 28 D, 30 D, 28 E, 30 E are chamfered to protect the airbag bag 18.
• the deploying airbag body 18 contacts the lower surfaces 28A, 30A of the projections 28, 30 to form the projections 28, 30. Press upward (in the direction of arrow A in Fig. 2). For this reason, an impact load instantaneously acts on the projection 28.30 from the airbag bag body 18, and the air bag body 18 smoothly breaks from the center portion 24A of the tier portion 24. As a result, even if the thickness of the tier portion 24 is large, it can be easily broken, and it is possible to achieve both deployment performance and appearance quality (invisible).
• the load on the hinge portion 26 can be reduced.
• the airbag door portion 20 can be made of a hard material having high rigidity, it is possible to prevent a squeaky feeling and deformation.
• the projections 28 and 30 are provided with ribs 3 integrally formed with the airbag door portion 20.
• the projections 28, 30 can be formed without the need to attach separate parts, and the widths (T1) of the ribs 32, 34 and the general part of the airbag door 20 Since the thickness is smaller than the thickness (T) (T 1 ⁇ TZ 2), it is possible to suppress the occurrence of sink marks due to the ribs 3 2 and 3 4 on the surface of the airbag door section 20 after injection molding, so that the appearance quality is improved. It does not invite the deterioration.
• the projections 28, 30 are formed in a grid pattern by narrow ribs 3 extending in the vehicle longitudinal direction and narrow ribs 34 extending in the vehicle width direction.
• the shape of the projections 28 and 30 is not limited to this, and for example, as shown in FIG. 5, another shape such as a letter shape may be used.
• the tier portion 24 is formed in a rectangular shape in plan view, but the shape of the tier portion 24 is not limited to this, and for example, as shown in FIG. ), A shape in which two ⁇ characters are overlapped as shown in FIG. 6 ( ⁇ ), and an X shape as shown in FIG. 6 (C). Further, as shown in FIG. 6 (D), when the tier portion 24 has an X-shape, projections 29, 31 are formed with the tier portion 24 interposed therebetween in the vehicle width direction. Is also good. In addition, as shown in FIG. 6 ( ⁇ ), when the tier portion 24 has a U-shape, a protrusion is formed on one side of the tier portion 24.
• a metal made of a metal such as aluminum, iron, or stainless steel is provided below the front door portion 2OA and the rear door portion 20B of the airbag door portion 20, respectively. Plates 36 and 38 are provided. Front end of metal plate 3 6
• the metal plate 36 has a trapezoidal shape with a narrow rear portion
• the metal plate 38 has a trapezoidal shape with a narrow front portion.
• the width W2 and length L2 of the protrusions 44 and 46 are the same as the total width W of the front door portion 20A and the rear door portion 20B of the airbag door portion 20 shown in FIG. Each is set to about 5% to 10% of the total length L. For this reason, the airbag door portion 20 is not extremely deflected in the width direction and the length direction by the projections 44 and 46, and the airbag door portion 20 is expanded when the airbag body is deployed. By bending in the width direction and the length direction, it is ensured that the center portion 24 A of the tier portion 24 is broken.
• the projections 44, 46 are formed on the lower surface side of the metal plates 36, 38, that is, on the side of the airbag body 18, but instead shown in FIG. As shown, the protrusions 44, 46 may be formed on the upper surface side of the metal plates 36, 38, that is, on the airbag door portion 20 side. In this case, the protrusions 44, 46 are provided on the upper surfaces of the tips 36B, 38B of the metal plates 36, 38, so that, as shown in FIG.
• the airbag bag 18 is securely in contact with each lower surface of the flat metal plates 36, 38. Since the projections 44 and 46 are pushed up in the direction of arrow A, the tear 24 can be reliably broken from the center portion 24A of the tear portion 24. As shown in FIG. 11, when the projections 44, 46 are formed on the upper surface side of the metal plates 36, 38, that is, on the side of the airbag door portion 20, the metal plates 36, 38 are formed. Even when the shape of the airbag door is rectangular, the projections 44 and 46 can be reliably brought into contact with both sides of the center portion of the tier portion of the airbag door portion in the vehicle longitudinal direction.
• the hinge portions are not particularly formed on the metal plates 36 and 38, but the metal plate 3 and the metal plate 3 are provided at a position substantially opposed to the hinge portion 26 of the airbag door portion 20. 6, 38 may be bent upward or downward in a U-shape to form a hinge.
• a metal such as aluminum, iron, stainless steel, or the like is provided below the front door portion 20A and the rear door portion 20B of the airbag door portion 20, respectively.
• Metal plates 48 and 50 are provided.
• the front end 48 A of the metal plate 48 is fixed to the airbag case 14 by a bolt 51 and a nut 52, and the rear end 50 A of the metal plate 50 is a bolt 53.
• the nut 54 secures it to the airbag case 14.
• the hinge portions 48B, 50B of the metal plates 48, 50 are thin and thick. These hinge portions 48 B and 50 B are offset downward (offset amounts H 1 and H 2) with respect to the hinge portion 26 of the airbag door portion 20, and the tier portion 24 B is provided.
• the center part of the metal plate is offset to the A side (offset amount K and K2).
• the front ends of the metal plates 48 and 50 which are the hinge parts 48B and 50B, and the mounting part Part 48 A, the part between the rear end part 50 A and the hinge part 48 B, 50 B and the part between the front end part 48 C, 50 C are hinge parts 48 B, 5 Higher rigidity than 0B. That is, only the hinge portions 48B and 50B are thin and have low rigidity.
• the deployed airbag bag 18 when the airbag bag is deployed, as shown in FIG. 13, the deployed airbag bag 18 is brought into contact with the lower surfaces of the metal plates 48, 50, and the metal plates 48, 50. Press the tops 48 C and 50 C of 50 upward (in the direction of arrow A in FIG. 13). For this reason, the instantaneous impact load from the airbag bag body 18 is high rigidity of the metal plates 48, 50.
• the tip portion 48C, 50C of the airbag door portion 20 through the tip portion 2 Since the airbag door portion 20 acts on both front and rear sides of the center portion 24 A of the airbag door 4, the airbag door portion 20 smoothly breaks from the center portion 24 A of the tier portion 24. As a result, even if the thickness of the tier portion 24 is large, it can be easily broken, so that it is possible to achieve both deployment performance and appearance quality (invisible).
• the hinge portions 488, 50B of the metal plates 48, 50 are offset from the hinge portion 26 of the airbag door portion 20 on the central portion 24A side of the tier portion 24.
• the portion between the hinge portions 48 88 and 50 B of the metal plates 48 and 50 and the front end portion 48 A and the rear end portion 50 A which are the mounting portions has high rigidity. Therefore, when the airbag bag is deployed, the airbag bag can be expanded by the part between the hinges 48B and 50B of the metal plates 48 and 50 and the front end 48A and the rear end 50A. Since the door 18 can be prevented from directly contacting the hinge 26 of the airbag door 20, breakage of the hinge 26 of the airbag door 20 by the airbag 18 can be prevented.
• the hinge portions 488, 50B of the metal plates 48, 50 are made thin, but instead, as shown in FIG.
• the hinge portions 48B, 50B of 8, 50 may have other configurations such as bending the metal plates 48, 50 upward in a U-shape.
• the front door 2OA of the airbag door 20 is provided.
• door hinge portion protection plates 56, 58 made of metal such as aluminum, iron, stainless steel, etc. having high breaking force are provided, respectively. ing.
• the front 56A of the door hinge protection plate 56 is fixed to the airbag case 14 by bolts 51 and nuts 52, and the rear 58A of the door hinge protection plate 58 is bolted. It is fixed to the airbag case 14 by 53 and nuts 54.
• the rear part 5 B of the door hinge part protection plate 56 and the front part 58 B of the door hinge part protection plate 58 are located at the center part of the tee part 24 more than the hinge part 26 of the airbag door part 20. 4A, and extends to a position close to the back surface of the airbag door portion 20.
• the extension of the rear part 56B of the door hinge part protection plate 56 and the front part 58B of the door hinge part protection plate 58 is plastically deformed to some extent by the impact load from the airbag bag 18. It has a good configuration.
• the rear part 56 B and the front part 58 B of the door hinge part protection plates 56, 58 are respectively located at the center part 2 of the tier part 24 more than the hinge part 26 of the airbag door part 20.
• 4 Protrudes to the A side and extends to the position near the back of the airbag door section 20, so that when the airbag body is deployed, the airbag bag body 18 hinges to the airbag door section 20. Since it is possible to prevent direct contact with the part 26, it is possible to prevent the hinge part 26 from being damaged by the airbag bag 18. Further, since the hinge portion 26 of the airbag door portion 20 can be protected, it is easy to break from the central portion 24 A of the relatively low-strength tier portion 14.
• the same hard resin is used as the airbag door portion 20 as the base material of the airbag door portion and the main body portion 22 as the base material of the main body portion.
• the surface (design surface) of the integrally formed base material 60 is integrally formed of a material, and a skin 62 made of, for example, PVC, TPO, fabric, or the like is provided by insert molding or pasting molding. Has been established. On the back (base) side or front side of the skin 62, for example, a thinned tier 64 is formed along the tier 24 of the base. Covers the surface (design surface) of substrate 60 Next, the operation of the fifth embodiment will be described.
• the deployable airbag body 18 contacts the lower surfaces 28A, 3OA of the protrusions 28, 30 to form the protrusions 28, 30. Press upward. For this reason, an impact load instantaneously acts on the projections 28 and 30 from the airbag bag body 18 and breaks smoothly from the center portion 24 A of the tier portion 24, and the outer skin 6 2 also covers the tier portion 6. Breaks smoothly from 0. As a result, even if the thickness of the tier portion 24 is large, the tier portion can be easily broken, so that it is possible to achieve both deployment performance and appearance quality (invisible).
• the load on the hinge portion 26 can be reduced.
• the airbag door portion 20 can be made of a hard material having high rigidity, it is possible to prevent a squeaky feeling and deformation.
• the development performance and the suppression of deterioration in the appearance quality transferred to the skin 62 are suppressed.
• a complicated mold structure is not required as compared with two-color molding, and post-processing of the tier portion 24 of the base material 60 is not required.
• a skin 62 with a foam layer 63 shown in FIG. 18 (B) may be used in addition to the single layer skin 62 shown in FIG. 18 (A).
• a sixth embodiment of a vehicle interior member having an airbag door portion of the present invention will be described with reference to FIG.
• a foam layer 70 made of, for example, urethane foam is foamed between the base material 60 and the skin 62.
• the air bag bag that is deployed 18 Touches the lower surfaces 28 A, 30A of the projections 28, 30 and presses the projections 28, 30 upward. For this reason, an impact load instantaneously acts on the projections 28 and 30 from the airbag bag body 18 and breaks smoothly from the central portion 24 A of the tier portion 24, and the foam layer 70 and the skin 6 2 also breaks smoothly. As a result, even if the thickness of the tier portion 24 is large, it can be easily broken, and it is possible to achieve both deployment performance and appearance quality (invisible).
• the load on the hinge portion 26 can be reduced.
• the airbag door portion 20 can be made of a hard material having high rigidity, it is possible to prevent a squeaky feeling and deformation.
• the airbag door section 20 can be made of a hard material having high rigidity, it is possible to prevent a squeaky feeling and deformation.
• the development performance and the suppression of deterioration in the appearance quality transferred to the skin 62 are suppressed.
• the fastening parts of the reinforcing iron plate and the separate door base material are not required, and the fastening work is also unnecessary.
• the hinge portion 26 of the airbag door portion 20 includes a main body portion.
• a thin portion having a predetermined thickness N over a predetermined front-rear width M is provided adjacent to a case mounting portion 72 for mounting the airbag case 14 formed on the base 22.
• grooves 74 and 76 having a U-shaped cross section serving as bending points are formed.
• portions 26A in which the grooves 74 and 76 are not set in the vehicle width direction are set on both sides of the groove 76.
• the ends of the grooves 74 and 76 are not continuous with the front and rear tear lines 24 B and 24 C of the tier portion 24.
• the groove 76 on the rear side of the vehicle is longer than the groove 74 on the front side of the vehicle, and the depth of the groove 76 is deeper than the depth of the groove 74.
• the ends 80 of the front and rear tear lines 24 B and 24 C of the tier portion 24 are all straight stop shapes. Next, the operation of the seventh embodiment will be described.
• the bending point S of the hinge portion 26 of the airbag door portion 20 is positioned at the groove 74, and the plate thickness is reduced. It can be separated from the boundary P between the case mounting part 72 and the sudden change. As a result, the local flexural expansion rate (bending outer surface elongation rate) due to the bending of the hinge portion 26 can be reduced. Moreover, since the grooves 74 are formed, the surface development length of the bent portion can be increased, and the substantial deployment rate can be reduced.
• the hinge portion 26 since a portion 26 A where the grooves 74 and 76 are not set in the vehicle width direction is provided, it is possible to prevent the hinge portion 26 from being damaged by a shearing force at the initial stage of the airbag deployment, and to provide the grooves 74 and 76.
• the thickness By setting the thickness, it is possible to prevent a decrease in resin flow due to a reduction in the plate thickness during injection molding. Further, by adjusting the length of the grooves 74, 76, the door deployment angle (door bending angle) can be adjusted.
• the tier 24 of the airbag door 20 is H-shaped, and both ends of the grooves 74 and 76 are not continuous with the front and rear tear lines 24 B and 24 C of the tier 24, bending is performed.
• the cracks in the grooves 74 and 76 due to the cracks can be prevented from developing in the direction of the tear lines 24B and 24C.
• the length of the groove 76 on the rear side of the vehicle is longer than the length of the groove 74 on the front side of the vehicle, the deployment opening of the rear door portion 20B on the rear side of the vehicle (occupant side) is reduced. Because it can be made large, the airbag bag 18 can be deployed smoothly. Also, by changing the length or depth of the grooves 74 and 76, the door opening angle (door bending angle) can be easily adjusted.
• a groove 74 on the vehicle front side and a groove 76 on the vehicle rear side are formed in the airbag door portion 20 one by one.
• the number and formation positions of 74, 76 are not limited to this, and even if each groove 74, 76 is divided into a plurality of short grooves 82, 84 as shown in FIG. good.
• Fig. 23 (B) As shown in (2), the position of the divided groove 82 may be made closer to the end 80 of the front and rear tear lines 24B and 24C.
• the grooves 82, 84 are formed in an arc shape bulging away from each other as shown in FIG. As shown in FIG.
• the cross-sectional shape of the grooves 74 and 76 is not limited to the U-shape, but may be another shape such as a V-shape.
• the tear line 24 is not limited to the H shape, but may be a U-shaped tear line 24 as shown in FIG. 23 (E), or an X-shaped tear line 2 as shown in FIG. 23 (F). 4 is fine.
• the reference numeral 85 in FIG. 23 (F) indicates a divided groove.
• the cross section of the thin portion 24 is V-shaped, and as shown in FIG. 26, the V-shaped height h of the thin portion 24 is a general value of the airbag door portion.
• the thickness is set within the range that does not exceed the thickness, for example, 0 mm and h 5 mm. If the general thickness of the airbag door is large, h may be further increased.
• the vicinity of the tip (bottom) 24 A is a tear portion when the airbag door is deployed, and the vicinity of the tip 24 A constitutes the front door 2 OA of the airbag door 20.
• a resin flow boundary 25 between the resin and the resin constituting the rear door portion 20B is set.
• the upper mold 130 as a mold on the design side of the instrument panel, and the cavities 13 4 of the upper mold 130 and the lower mold 13 2, Resin is injected from a predetermined different gate G 1 or gate G 2 (see FIG. 25) to form a front door portion 20 A of the bag door portion 20, and a gate G 1 or gate G 2 is formed.
• the resin is injected from G2 to form the rear door portion 20B.
• the tip 140 A of the slide core 140 having a substantially triangular cross section has a slight initial gap S (0 ⁇ S ⁇ 2 mm) apart and in close proximity, effectively separating cavity 134.
• the slide core 140 is arranged in the lower mold 132 so as to be movable in the direction of approaching / separating from the upper mold 130 (arrow A direction and arrow B direction in FIG. 26). I have. Further, as shown in FIG. 28 as an example of the molding conditions, the injection start time T2 of the gate G1 is delayed by a time TS (start shift time) with respect to the injection start time T1 of the gate G2. As a result, the time T3 required for the resin of the front door portion 20A injected and flown by the gate G1 to reach the tip 14OA of the slide core 140 and to fill the front door portion 2OA.
• TS start shift time
• a space 150 corresponding to the moving volume of the slide core 140 is generated, and the resin of the front door portion 20A is formed by the resin of the front door portion 20A before the pressure holding completion time T6. 0 A is filled, and the rear space 150 B of the space 150 is filled with the resin of the rear door portion 20 B.
• the tip (bottom portion) 24 of the thin portion 24 A and the resin flow boundary 25 coincide, and the state shown in FIG. 27 is obtained.
• the front space 150A and the rear space 150B, which are filled with resin for easy understanding, are different from each other.
• the time T5 shown in FIG. 28 indicates the pressure holding start time, and after the pressure holding completion time T6, the process shifts to cooling.
• the holding pressure is applied to the injected resin at an injection pressure of 1Z2 or less to further stabilize the weight, dimensions, and shape of the molded product.
• the holding pressure is lowered in two stages, VI and V2. Since the value V1 of the first-stage holding pressure greatly affects the quality of the entire product, it is difficult to change the degree of freedom and the degree of freedom is low only for the resin merging (welding) strength of the tier portion of the present embodiment.
• the value V 2 of the second-stage dwelling pressure does not significantly affect the quality of the entire product because the effect of the first-stage dwelling pressure is exerted, and therefore the degree of freedom is high. Therefore, it is desirable that the core back timing of the slide core 140 be set after the first-stage dwell time, ie, during the second-stage dwell stage, in which product failure is unlikely to occur.
• factors affecting the welding strength of the resin include the surface pressure of the resin and the resin temperature at the welding interface (the lower the surface pressure and the resin temperature, the lower the surface pressure and the resin temperature).
• the welding strength decreases). Therefore, in the present embodiment, the surface pressure of the resin at the tier weld interface is controlled by the holding pressure, and the resin temperature of the tier weld interface is controlled by the core back timing and the thickness of the tier peripheral plate. The breaking force was controlled to a desired value.
• the first resin 180 and the second resin 182 are brought into a melted state by raising their respective welding interface temperatures in advance, and then press each other in the direction of pressing each other (arrow X 1 , X2 direction) and are joined to each other by a predetermined force.
• the welding strength at the welding interface 184 between the first resin 180 and the second resin 1802 two factors affecting the welding strength are generally known on the welding principle. It is the surface pressure of the resin at the welding interface 184 and the temperature of the resin.
• the same idea can be applied to control the strength of the welding of the tear portion of the present embodiment.
• the holding pressure as an in-mold pressure related to the surface pressure transmitted to the welding interface.
• the breaking strength of the tier can be easily and accurately controlled to a desired value.
• the core back timing is too early than the filling completion, the filled resin flows into the space on the unfilled side and the resin flow boundary shifts from the slide core break prediction part.
• the core back timing is set after the filling is completed, the displacement between the resin flow boundary and the portion to be broken can be prevented.
• the first stage of the pressure holding between the pressure holding start time (T 5) and the pressure holding completion time (T 6) It is preferable to set the core back timing T7 of the slide core 140 after the elapse of the time, and that the resin temperature does not become too low. Is most preferred.
• the holding pressure may be lowered in three or more stages, and the core back timing may be set after the second-stage holding pressure.
• the core back timing after the second stage dwelling, the first stage dwelling is ensured, so that the weight, dimensions and shape of the molded product can be stabilized, and the product Can be reduced.
• the core back area of the slide core 140 for forming the thin portion 24 as a tier portion when the airbag door portion is opened that is, the thin portion 24
• the strength at the resin flow boundary 25 and the thickness control can reduce the tear force of the tier to a desired value.
• the airbag door portion 20 and the main body portion 22 of the instrument panel 10 can be molded with the same resin, there is no need to perform coating for each material (two types), resulting in low cost.
• the cavity 134 of the airbag door portion is divided at the tee portion by the slide core 140 having a substantially triangular tip.
• the resin is injected into each of the divided cavities at a time, and the slide core 140 is retracted by a small amount L before and after the resin is completely filled.
• the resin flow boundary 5 can be set in the core back region of the slide core 140 for forming the thin portion 24.
• the simple method has high reliability in ensuring functional quality and high productivity.
• the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to such an embodiment, and various other embodiments are possible within the scope of the present invention.
• the cross-sectional shape of the tier portion 24 may be another shape such as a U-shape in addition to the V-shape.
• the present invention provides a door trim, a center villa, a garnish, and a door trim in addition to the instrument panel. It is also applicable to dollars.
• an initial gap S (0 ⁇ S ⁇ 2 mm) is opened between the tip 140A of the slide core 140 and the upper die 130, and the slide core 140
• the interference between the tip 140 A and the upper die 130 was eliminated to prevent the surface of the die from scratches and ensure durability.
• the initial gap S must be set to 0. Assuming that 1 ⁇ S ⁇ 0.8 mm, the deviation between the resin flow boundary 25 at the surface portion and the tip 24 A of the thin portion 24 may be increased. In this case, although it is slightly disadvantageous to the easiness of tearing when the airbag bag is deployed, the appearance quality of the tier line from the design surface side at the tip 24 A can be improved with the same thickness.
• the injection start time T2 of the gate G1 is delayed by the time TS (start shift time) with respect to the injection start time T1 of the gate G2.
• the injection may be performed first from the gate G1, and the injection from the gate G2 may be delayed by the time TS to reduce the charging gap time (time lag) TL.
• the resin of the front door portion 20A injected from the gate G1 can be used for the slide core 140.
• the time T3 for reaching the tip 140A and the time T4 for the resin of the rear door portion 20B ejected from the gate G2 to reach the tip 140A of the slide core 140 are T4. If that is the same, that is fine.
• the range in which the slide core 140 is provided may be the entire H-shaped thin portion 24, as shown in FIG. 29 (A), as long as the deployment performance is satisfied and the mold structure allows.
• the range of the slide core 140 may be limited to the range along the horizontal line of the H-shaped thin portion 24.
• the range of the slide core 140 may be limited to the range along the vertical line of the H-shaped thin portion 24.
• the range of the slide core 140 may be limited to only a part of the H-shaped thin portion 24.
• the cross-sectional shape of the thin portion 24 may be an R shape shown in FIG. 30A or a stepped shape shown in FIG. 30B in addition to the V-shape.
• the timing of the core back of the slide core 140 is not only instantaneous anywhere from time T3 to time T6 in FIG. 28, but also time T if the resin can flow. It may be performed during the cooling time after 6.
• the core back speed of the slide core 140 may be instantaneous or a relaxed speed such as spending time T3 to time T6.
• the resin of the front door portion 20A is filled not only from the gate G1 but also from the gate G2, so that only one gate may be used.
• the molding method of the eighth embodiment is not limited to the double-ended (double door) type airbag door part in which the thin part 24 as shown in FIG. 25 is formed in an H shape in plan view. 24 is also applicable to an instrument panel having an airbag door portion of another shape such as a U-shape or an X-shape in plan view, and a method of forming the same.
• the range of providing the slide core 140 is shown in Fig. 29 (H) as long as the deployment performance is satisfied and the mold structure allows.
• the whole of the U-shaped thin portion 24 may be along the horizontal line of the U-shaped thin portion 24 as shown in FIG. May be limited to the range.
• the range of the slide core 140 may be limited to only a part of the U-shaped thin portion 24.
• the molding method of the eighth embodiment uses a slide core 163 using different resins for the main body section 160 of the instrument panel and the airbag door section 162.
• the present invention is also applicable to an instrument panel 164 having an airbag door unit integrated by two-color molding.
• the molding method according to the eighth embodiment includes a main body part 170 and an airbag door part 1 of a separate instrument panel.
• the present invention can also be applied to an instrument panel 174 having an airbag door portion integrated with an engaging claw, a screw, or the like after injection-molding the resin sheet 72 with a resin.
• the molding method according to the eighth embodiment includes a so-called skin sensor including a base material 60 and a skin 62 covering a design surface 60 A of the base material 60.
• a tier portion 64 is formed along the groove 24 in the outer skin 62, and the outer skin 62 is set to be easily broken when the airbag bag is deployed. Or, even without the tier portion 64, the airbag door portion is made of a material having high rigidity, and local tension is generated at the same time as the airbag door portion is unfolded.
• the skin 62 shown here has two layers of skin 62, shown in FIG. 17 (B), in addition to the single layer skin 62 shown in FIG. 17 (A). A three-layered skin 62 shown in FIG. 17 (C) may be used.
• the molding method of the eighth embodiment includes a base material 60, a skin 62, and a foam layer 70 between the base material 60 and the skin 62.
• the present invention is also applicable to an instrument panel 10 as an integrally foamed vehicle interior member.
• the tear portion 64 formed on the skin 62 shown in FIGS. 34 and 35 may be formed not only from the front side but also from the back side.
• the shape of the tier portion 64 is not limited to the U-shaped cross section, but may be another shape such as a V-shaped cross section or a slit.
• the present invention provides an instrument panel 10 as an interior member for a vehicle according to the eighth embodiment shown in FIG. 24, and a projection 28 as a push-up means according to the first embodiment shown in FIG. , 30 may be provided to provide the configuration shown in FIG.
• the present invention is applied to an instrument panel 10 as an interior member for a vehicle integrally having an airbag door portion according to an application example of the eighth embodiment shown in FIG.
• Protrusions 28 and 30 as the push-up means of one embodiment may be provided to have a configuration shown in FIG.
• the present invention provides an instrument panel 10 as an interior member for a vehicle integrally having an airbag door portion according to another application example of the eighth embodiment shown in FIG. 35, and FIG.
• a protrusion 28.30 as a push-up means of one embodiment may be provided to have a configuration shown in FIG.
• Industrial applicability INDUSTRIAL APPLICABILITY As described above, the vehicle interior member having the airbag door portion and the method of molding the same according to the present invention include molding the airbag door portion of the vehicle interior member and the body portion of the vehicle interior member with the same resin. In particular, it is suitable for lowering the breaking force of the broken portion of the airbag door portion to a desired value without deteriorating the appearance quality.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Air Bags (AREA)
• Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

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Applications Claiming Priority (6)

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Citations (19)

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• 1998
  • 1998-03-20 CA CA002256497A patent/CA2256497C/en not_active Expired - Fee Related
  • 1998-03-20 DE DE69840821T patent/DE69840821D1/de not_active Expired - Lifetime
  • 1998-03-20 ES ES98909787T patent/ES2324321T3/es not_active Expired - Lifetime
  • 1998-03-20 EP EP07020983A patent/EP1882616B1/de not_active Expired - Lifetime
  • 1998-03-20 CN CNB988003678A patent/CN100374328C/zh not_active Expired - Fee Related
  • 1998-03-20 KR KR1019980709553A patent/KR100307105B1/ko not_active IP Right Cessation
  • 1998-03-20 US US09/194,355 patent/US6612607B1/en not_active Expired - Fee Related
  • 1998-03-20 DE DE69842246T patent/DE69842246D1/de not_active Expired - Lifetime
  • 1998-03-20 WO PCT/JP1998/001207 patent/WO1998042547A1/ja active IP Right Grant
  • 1998-03-20 EP EP98909787A patent/EP0904994B1/de not_active Expired - Lifetime
• 2003
  • 2003-03-26 US US10/396,554 patent/US6733713B2/en not_active Expired - Fee Related
• 2004
  • 2004-01-09 US US10/753,358 patent/US7063349B2/en not_active Expired - Fee Related

Patent Citations (19)

Non-Patent Citations (1)

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